About this item 100% PLASTIC Premium Structural Support: 💡 1.Achieve robust stability with Stack Shim's heavy-duty leveling, surpassing traditional wood for reliable window, door, and architectural support. Flexible Adjustability: 💡 2. Customize leveling precisely with adjustable thickness and length options, ensuring a perfect fit for various installation projects. Effortless Installation: 💡 3.Featuring an intuitive easy snap design, Stack Shim enables swift and efficient adjustments during installation. Time-Saving Stacks: 💡 4.Heat-sealed into 1" stacks, 16 shims per stack make separation easy, saving time and effort in your tasks. 5. 💡 Strong Compressive Strength: Experience exceptional compressive strength that suits heavy-duty applications, guaranteeing durability and stability. 6. 💡Proudly Made in the USA: Crafted from high-quality plastic, Stack Shim stands as a testament to American manufacturing standards. 7. 💡 Versatile Options: Choose from a diverse range of color-coded shims and solid thicknesses including black, blue, and red, catering to various preferences